No flash will replace a full-fledged studio lighting (although, in the studio with multiple external flashes, you can use the same lighting circuits). But it allows to obtain the correct flash-exposed shots with a lack of light in a sequential shooting - especially indoors.

It happens that after a lot of time spent to apply the right makeup, selection of colors, clothes and suitable background the result is not as good as expected. And it seems the camera was set up as it should, and interesting background is selected, but the result is not what was expected.